相邻两馏分恩式蒸馏曲线（），表示其分馏精确度越高。
A.间隙越大
B.重叠越小
C.重叠越大
D.间隙越大或重叠越小
参考答案：D
Her husband and she are now at work on a new dictionary ______ next year.
A．to publish
B．being published
C．published
D．to be published
当采用管井取水时应设备用井，备用井的数量一般可按( )的设计水量确定。
A．10%～20%
B．15%～20%
C．10%～30%
D．10%～25%
